Few-body correlations in nuclear systems

核系统中的少体相关性

• 批准号: 422826161
• 负责人: Professor Dr. Gerd Röpke
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/422826161?language=en
• 关键词: Few; body; correlations; nuclear; systems

The properties of light elements (2H, 3H, 3He, 4He) are modified when they are imbedded in a nuclear medium. Within a quasiparticle approach, the energies of the clusters are dependent on the center of mass momentum as well as the density, the temperature, and the asymmetry of the surrounding medium. At present, these quasiparticle energy shifts are calculated assuming an uncorrelated medium. We calculate the shifts taking into account correlations in the medium (i.e. the composition) in a self-consistent way. A precise calculation of in-medium few-nucleon correlations is an important ingredient for the evaluation of the composition and the equations of state of nuclear matter. It can be applied in astrophysics to describe compact objects (supernovae, neutron stars) as well as in the investigation of heavy-ion collisions. Few-nucleon correlations, in particular alpha clustering, is of interest in nuclear structure physics. We investigate alpha-like correlations (quartets) near the surface of heavy nuclei. In particular, the alpha preformation factor is calculated for the alpha-decay of heavy nuclei, e.g., of the polonium isotopes.

轻元素（2H，3H，3He，4He）的性质在它们嵌入核介质时发生改变。在准粒子方法中，团簇的能量取决于质心动量以及周围介质的密度、温度和不对称性。目前，这些准粒子的能量移动计算假设一个不相关的介质。我们以自洽的方式计算位移，同时考虑到介质（即成分）中的相关性。介质中少核子关联的精确计算是评价核物质组成和状态方程的重要组成部分。它可以在天体物理学中用来描述致密物体（超新星、中子星），也可以用来研究重离子碰撞。少核子关联，特别是α成簇，是核结构物理研究中的一个热点。我们研究了重核表面附近的类α关联（四重态）。特别地，计算了重核α衰变的α预形成因子，例如，钋的同位素。